How to export the value from the promise - node.js

Question

I am fairly new to node and mongoose and I am having some issues with module.exports. While trying to make my code a bit more clean I have been trying to use modules to take the mongoDB queries since they take too much space and it does not that easy to read, but I got an error.
Here I am merging 2 collections to get a result but the console on index.js tells me undefined. When I do a console.log on operations.js and then execute on index, the console from inside return the array but not the one outside.
After a bit of reading I see that is because the value i want is inside of the promise, but how can I get it back then?
operations.js
const express = require('express')
const mongoose = require('mongoose')
const CheckOutOrder = require('../models/CheckOutOrder')
function ordersQuery(){
console.log('lol')
CheckOutOrder.aggregate([
{
$match:{
'is_open':1
}
},
{
$addFields:{
'itemToMatch':{
$toObjectId:'$idItem'
}
}
},
{
$lookup:{
from: 'e_menu_items',
localField: 'itemToMatch',
foreignField: '_id',
as: 'itemsReceipt'
}
},
{
$unwind:'$itemsReceipt'
}
]).then(info => {
console.log(info)
return info
}).catch(e => {
console.log('e')
return e
})
}
module.exports.totOrders = ordersQuery
index.js
const mongoQueries = require('../mongo/operations')
if(ActionDOM=='test'){
let orders = []
orders = mongoQueries.totOrders()
console.log('------------------------------------------------------')
console.log(orders)
}
console
lol
------------------------------------------------------
undefined
[
{
_id: new ObjectId("61da4036bc966b2a284e8075"),
idReceipt: 4,
idUser: '61d1606420f281d51d52e2e1',
idItem: '61d7f9205bda9c3be60b14ed',
is_open: 1,
date_added: 2022-01-09T01:53:58.017Z,
__v: 0,
itemToMatch: new ObjectId("61d7f9205bda9c3be60b14ed"),
itemsReceipt: {
_id: new ObjectId("61d7f9205bda9c3be60b14ed"),
menuItem: 'Molletes',
description: 'Frijoles, queso y salsa',
price: 18,
id_cat: 1,
is_active: 1,
date_added: 2022-01-07T08:26:08.990Z,
date_modified: 2022-01-07T08:26:08.990Z,
__v: 0
}
},
{
_id: new ObjectId("61da4036bc966b2a284e8079"),
idReceipt: 4,
idUser: '61d1606420f281d51d52e2e1',
idItem: '61d7f9205bda9c3be60b14ed',
is_open: 1,
date_added: 2022-01-09T01:53:58.128Z,
__v: 0,
itemToMatch: new ObjectId("61d7f9205bda9c3be60b14ed"),
itemsReceipt: {
_id: new ObjectId("61d7f9205bda9c3be60b14ed"),
menuItem: 'Molletes',
description: 'Frijoles, queso y salsa',
price: 18,
id_cat: 1,
is_active: 1,
date_added: 2022-01-07T08:26:08.990Z,
date_modified: 2022-01-07T08:26:08.990Z,
__v: 0
}
}
]
What am I doing wrong?

Answer 1

You can use async/await to make the code more "linear":
async function ordersQuery() {
console.log('lol');
try {
const info = await CheckOutOrder.aggregate([
{
$match: {
is_open: 1,
},
},
{
$addFields: {
itemToMatch: {
$toObjectId: '$idItem',
},
},
},
{
$lookup: {
from: 'e_menu_items',
localField: 'itemToMatch',
foreignField: '_id',
as: 'itemsReceipt',
},
},
{
$unwind: '$itemsReceipt',
},
]);
console.log(info);
return info;
} catch (e) {
console.log(e);
return e;
}
}
and then call it with await too (the calling function must be declared async):
async function someFunc(/*....*/) {
// ...
if (ActionDOM == 'test') {
let orders = [];
orders = await mongoQueries.totOrders();
console.log('------------------------------------------------------');
console.log(orders);
}
// ...
}